Haiku Weather in September

September in Haiku brings high temperatures, with highs of 28°C (82°F) and nights dropping to 23°C (73°F). Rainfall is on the higher side this month, averaging around 63 mm (2.5 in), so keep a rain jacket handy.

Rainfall in Haiku in September

Climate statistics over the past 30 years suggest around 8 days of rain, with 63 mm (2.5 in) average for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Haiku in September

The perfect temperature in Haiku in September makes it a solid month to visit, with 28°C (82°F) during the day and 23°C (73°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights are warm at 23°C (73°F). It's worth making sure your accommodation has decent ventilation or air conditioning. This is typically the warmest month of the year, so light summer clothing is a good idea.

Sunshine in Haiku in September

Expect sunny days throughout the month, with an estimated 271 hours of sunshine. This makes it a pleasant time to visit Haiku.

Wind Speed in Haiku in September

Wind speeds average 5 m/s (10 knots) during September. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.

Average water temperature in September

At 27°C (81°F), the water is warm and comfortable for swimming. Most people find this temperature ideal for spending longer periods in the water.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Haiku.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Hawaii, check out our Haiku's climate page.

Haiku Temperature in September

Min Temperature 23°C (73°F)  

Max Temperature 28°C (82°F)  

Water Temperature 27°C (81°F) *  

Chance of Rain 25%  

Precipitation 63 mm (2.5 in)  

Rainy days 8 days  

Humidity 70% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 271 hours *  

Percentage Sunshine 74% *  

* Data from: Kahului, the United States of America (11 KM, 7 Miles).

What to Wear in Haiku in September

Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Rain is likely on several days, so bring a good rain jacket. With water temperatures around 27°C (81°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Haiku in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

8/10

Walking

8/10

Camping

8/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Hawaii, check out our Haiku's climate page.

More climate data for Haiku

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Haiku climate overview or explore weather in Hawaii.